Jim Leary, the archaeological director for English Heritage throughout the work, thinks he has solved a riddle which archaeologists have fretted over for centuries: why thousands of people piled up 35 million baskets of chalk into the largest artificial hill in Europe, now part of the Stonehenge World Heritage site. It wasn't the final structure, but the staggering contribution of work which was important, he now believes, marking a site of immense but only guessable significance to the hunters and farmers of Bronze Age Wiltshire.
Read the whole thing. Kind of an amazing set of circumstances. I mean, it's kind of a boring result, but one that makes sense.